JP2009101440A - Manufacturing method of spectacle lens - Google Patents

Abstract

Provided is a spectacle lens manufacturing method capable of reducing the lens thickness and suppressing a decrease in performance.
A spectacle lens manufacturing method includes: a first process for generating a semi-finished lens; a second process for holding a surface of the semi-finished lens with a holding member; and processing a back surface of the semi-finished lens to A third process for generating a first part and a second part arranged around the first part, and processing at least a second surface opposite to the first surface of the first part facing the holding member A semi-finished lens is processed so that the curvature of the second surface and the curvature of the third surface of the second portion disposed around the second surface are different from each other. To do.
[Selection] Figure 1

Description

  The present invention relates to a method for manufacturing a spectacle lens.

The spectacle lens is formed, for example, by processing a semi-finished lens called a semi-finished lens. The semi-finished lens is subjected to polishing or the like while being held by the holding member. The following patent document discloses an example of a technique related to a method for manufacturing a spectacle lens.
Japanese Patent No. 3845954

  If the semi-finished lens is processed while being held by the holding member, a part of the holding member may be cut and foreign matter may be mixed in the cutting waste. On the other hand, if an attempt is made to process a semi-finished lens without cutting the holding member, it may be difficult to make the semi-finished lens thinner, for example. As a result, the performance of the manufactured spectacle lens may be degraded.

  An object of an aspect of the present invention is to provide a method for manufacturing a spectacle lens that can reduce the thickness of the lens and suppress a decrease in performance.

  According to an aspect of the present invention, there is provided a spectacle lens manufacturing method comprising: a first process for generating a semi-finished lens; a second process for holding a surface of the semi-finished lens with a holding member; and a back surface of the semi-finished lens. A third process for processing to generate a first part to be a spectacle lens and a second part arranged around the first part, and at least the first surface opposite to the first surface facing the holding member A fourth process for processing the second surface of the second process, wherein the third process is such that the curvature of the second surface is different from the curvature of the third surface of the second part disposed around the second surface. A method of manufacturing a spectacle lens for processing a semi-finished lens is provided.

  According to the aspect of the present invention, the lens thickness can be reduced, and a decrease in performance of the spectacle lens can be suppressed.

  Hereinafter, embodiments of the present invention will be exemplarily described with reference to the drawings, but the present invention is not limited thereto.

  FIG. 1 is a flowchart for explaining an example of a method for manufacturing a spectacle lens 1 according to the present embodiment. FIGS. 2 to 7 are schematic diagrams for explaining a method for manufacturing the spectacle lens 1 according to the present embodiment. is there.

  The spectacle lens 1 manufacturing method according to the present embodiment includes a process for generating the semi-finished lens 2 (step SA1), a process for holding the surface 3 of the semi-finished lens 2 with the holding member 4 (step SA2), and a semi-finished process. Processing the back surface 5 of the lens 2 to generate a first portion 6 to be the spectacle lens 1 and a second portion 7 disposed around the first portion 6 (step SA3), and at least the holding member 4 Processing for processing the second surface 9 opposite to the first surface 8 of the first portion 6 facing the first surface (step SA4), processing for coating the lens processed the second surface 9 (step SA5), and second And a process of removing the portion 7 (step SA6).

  The process of step SA1 includes, for example, a process of supplying a monomer, which is a liquid material for manufacturing the spectacle lens 1 (semi-finished lens 2), to the internal space formed by the gasket and the mold member, And a process of heating the supplied monomer (polymerization process). The monomer includes a thermopolymerizable resin such as diethylene glycol bisallyl carbonate. The semi-finished lens 2 is produced by polymerizing the monomer (step SA1). After the semi-finished lens 2 is generated, the gasket and the mold member are removed from the semi-finished lens 2.

  The generated semi-finished lens 2 is held by the holding member 4 as shown in FIG. 2 (step SA2). The semi-finished lens 2 has a circular shape and has a front surface 3 and a back surface 5. In the present embodiment, the surface 3 of the semi-finished lens 2 that is the surface of the spectacle lens 1 is substantially the surface of the spectacle lens 1. That is, for example, before the process of step SA4 is completed, the surface of the spectacle lens 1 is formed in advance in the process of step SA1, and when the process of step SA1 is completed, the surface 3 of the semifinished lens 2 is almost finished. Yes. In other words, when the process of step SA1 is completed, the curvature (shape) of the surface 3 of the semi-finished lens 2 is substantially the same as the curvature (shape) of the surface of the spectacle lens 1 that is the final product. The process of step SA1 is executed. Therefore, in this embodiment, in order to obtain the desired spectacle lens 1 after step SA2, the back surface 5 and the side surface 10 of the semi-finished lens 2 other than the front surface 3 are processed. That is, in the present embodiment, the front surface 3 of the semifinished lens 2 is a non-processed surface, and the back surface 5 and the side surface 10 of the semifinished lens 2 are processed surfaces (prescription surfaces).

  The surface of the spectacle lens 1 is a refracting surface disposed on the object side when worn by the wearer. On the other hand, the back surface of the spectacle lens 1 is a refracting surface disposed on the wearer side in a state worn by the wearer and faces the wearer.

  The holding member 4 holds the surface 3 of the semifinished lens 2. The holding member 4 includes a block portion 12 having a holding surface 11 that faces the surface 3 of the semifinished lens 2, and a support portion 13 that supports the block portion 12. In this embodiment, the block part 12 is a low melting point alloy called an alloy. The support portion 13 is made of, for example, an alloy or iron. The holding surface 11 of the holding member 4 (block portion 12) has a shape corresponding to the surface 3 of the semifinished lens 2, and can favorably hold the surface 3 of the semifinished lens 2. In the present embodiment, a film member 14 is disposed so as to cover the surface 3 of the semifinished lens 2. The surface 3 of the semi-finished lens 2 is protected by the film member 14. The holding member 4 holds the semi-finished lens 2 via the film member 14.

  After the semi-finished lens 2 is held by the holding member 4, processing for processing the back surface 5 of the semi-finished lens 2 is started (step SA3). In the present embodiment, the process of step SA3 is performed by processing the back surface 5 of the semi-finished lens 2 to form the first portion 6 that becomes the spectacle lens 1 and the second portion 7 that is disposed around the first portion 6. Is generated. In step SA3, the process for processing the back surface 5 of the semi-finished lens 2 includes at least one of a process for cutting the back surface 5 of the semi-finished lens 2, a process for grinding, and a process for polishing. Further, in order to generate the first portion 6 and the second portion 7, the side surface 10 of the semi-finished lens 2 is also processed in step SA3. The processing in step SA3 is a so-called roughing processing for making the semifinished lens 2 into a substantially desired shape. The semi-finished lens 2 is processed on the back surface 5 and the side surface 10 while being held by the holding member 4.

  FIG. 3 is a schematic diagram showing the semi-finished lens 2 at the time when the processing of step SA3 is completed, FIG. 4 is an enlarged view of a part of FIG. 3 (part indicated by reference numeral A in FIG. 3), and FIG. FIG. 6 is a plan view schematically showing the semi-finished lens 2 at the time when the processing in step SA3 is completed.

  As shown in FIGS. 3 to 5, the first portion 6 has a first surface 8 that faces the holding member 4, and a second surface 9 opposite to the first surface 8. The second portion 7 has a third surface 15 disposed around the second surface 9. In the process of step SA3, the semi-finished lens 2 is processed so that the curvature of the second surface 9 of the first portion 6 and the curvature of the third surface 15 of the second portion 7 are different.

  In the present embodiment, the curvature of the third surface 15 is larger than the curvature of the second surface 9. That is, the curve of the third surface 15 is tighter than the curve of the second surface 9. An inflection point 16 is disposed between the second surface 9 and the third surface 15 (between the first portion 6 and the second portion 7), and the inflection point 16 serves as a boundary of the second surface 9. The curvature and the curvature of the third surface 15 are different.

  In the present embodiment, the curvature of the first surface 8 is larger than the curvature of the second surface 9. That is, the curve of the first surface 8 is tighter than the curve of the second surface 9.

  The first portion 6 is an optically effective portion, and is a portion that becomes the spectacle lens 1 when step SA6 ends. That is, the first part 6 is an optically designed part, and is a part that is designed according to the spectacle frame or the like.

  The second portion 7 is an optically ineffective portion and is removed from the first portion 6 when step SA6 ends. The second portion 7 is a portion whose shape is designed based on the cross-sectional shape, thickness, ease of processing, and the like of the first portion 6.

  After the 1st part 6 and the 2nd part 7 are produced | generated, the process which processes the 2nd surface 9 at least is performed (step SA4). In step SA4, the process of processing the second surface 9 includes a process of polishing the second surface 9. The processing of the second surface 9 in step SA4 is a so-called finishing processing for finishing the second surface 9 precisely. The process for processing the second surface 9 may include a process for cutting and grinding the second surface 9 and a process for polishing. In step SA4, the second surface 9 is processed while the semi-finished lens 2 is held by the holding member 4.

  By providing the second portion 7, it is possible to reduce the thickness of the first portion 6 while suppressing a part of the holding member 4 from being removed in the process of step SA <b> 4. The second portion 7 protects the holding member 4, and suppresses the holding member 4 from being polished when the second surface 9 of the first portion 6 is polished, for example.

  In the present embodiment, the third surface 15 is also polished together with the second surface 9 by polishing the second surface 9. Thereby, the thickness of the 1st part 6 can be made thin enough.

  After the process of processing the second surface 9 is completed, the lens 2k that processed the second surface 9 and the holding member 4 are separated. Here, in the following description, the lens 2k obtained by processing the second surface 9 is appropriately referred to as a polishing lens 2k.

  Thereafter, if necessary, a process for cleaning the polishing lens 2k is performed, and then a process for coating the polishing lens 2k is performed (step SA5).

  FIG. 6 is a diagram illustrating an example of a coating apparatus 17 that coats the polishing lens 2k. The coating apparatus 17 includes a container 19 in which a liquid (coating liquid) 18 to be coated on the polishing lens 2k is stored, and a holding mechanism 20 that holds a part of the polishing lens 2k. The polishing lens 2 k is immersed in the coating liquid 18 in the container 19 while being held by the holding mechanism 20. Thereafter, the polishing lens 2k is taken out of the container 19. Thereafter, a process of drying the polishing lens 2k is performed as necessary. Moreover, the process etc. which form the various functional films, such as the process which immerses the grinding | polishing lens 2k in another coating liquid, or an antireflection film, are performed as needed.

  For example, after coating, a phenomenon that the coating liquid 18 accumulates in a part of the polishing lens 2k, that is, a so-called liquid accumulation phenomenon may occur. In the following description, the coating liquid 18 accumulated in a part of the polishing lens 2k is appropriately referred to as a liquid reservoir 18D. In the present embodiment, since the second portion 7 is disposed around the first portion 6, the liquid reservoir 18 </ b> D is highly likely to be provided in the second portion 7 as shown in FIG. 6.

  Thereafter, a process of removing the second portion 7 from the first portion 6 is executed (step SA6). FIG. 7 is a plan view schematically showing an example of the first portion 6 after the second portion 7 is removed, that is, the spectacle lens 1. In the present embodiment, the inflection point 16 is also removed together with the second portion 7.

  As described above, since the second portion 7 is provided around the first portion 6 serving as the spectacle lens 1, it is possible to prevent the holding member 4 from being partly removed in the process of step SA4. The thickness of the first portion 6 can be reduced.

  8 and 9 are schematic diagrams according to the comparative example, and are diagrams illustrating a state in which the finishing process of the polishing lens 2J without the second portion (7) is performed. For example, as shown in FIG. 8, when the semi-finished lens 2 is polished so that the polishing lens 2 </ b> J has a desired thickness, for example, a part B of the holding member 4 (block portion 12) also moves together with the semi-finished lens 2. The possibility of being polished increases. In that case, various problems may occur, such as foreign matters mixed in the cutting waste, or the edge of the polishing lens 2J becomes sharp and inconvenient to handle. On the other hand, if the semifinished lens 2 is to be polished without scraping the holding member 4, it may be difficult to make the polishing lens 2J sufficiently thin as shown in FIG. 9, for example. As a result, there is a possibility that the performance of the spectacle lens 1 is deteriorated, for example, the thickness of the spectacle lens 1 to be manufactured increases or the weight increases.

  According to the present embodiment, since the second portion 7 is provided so as to protect the holding member 4, for example, when the second surface 9 of the first portion 6 is polished, the holding member 4 is also prevented from being polished. can do.

  Further, in the polishing of the semi-finished lens 2, there is a possibility that a phenomenon (so-called polishing sag phenomenon) in which the peripheral portion of the semi-finished lens 2 is not polished well may occur. According to the present embodiment, since the second portion 7 serving as the dummy portion is disposed around the first portion 6 serving as the spectacle lens 1, even if the polishing sag phenomenon occurs, the polishing sag phenomenon is , The possibility that it does not occur in the first portion 6 but occurs in the second portion 7 increases. Accordingly, it is possible to suppress a decrease in the performance of the first portion 6 that becomes the spectacle lens 2.

  Further, for example, even if a liquid pool phenomenon occurs after coating, the liquid pool 18D does not occur in the first portion 6 and is more likely to occur in the second portion 7. Accordingly, it is possible to suppress a decrease in the performance of the first portion 6 that becomes the spectacle lens 2.

  In the present embodiment, the case where the curvature of the third surface 15 is larger than the curvature of the second surface 9 has been described as an example, but the curvature of the third surface 15 is smaller than the curvature of the second surface 9. In addition, the holding member 4 can be protected, and the polishing sagging phenomenon, the liquid reservoir 18D and the like can be generated in the second portion 7 without being generated in the first portion 6.

  Further, the third surface 15 may not be a curved surface but may be a flat surface. That is, in the cross-sectional shape of the polishing lens 2k, the third surface 15 may be linear.

  In the present embodiment, the curvature of the first surface 8 is larger than the curvature of the second surface 9 and the spectacle lens 1 is a spectacle lens for hyperopia and is a positive lens with a positive power. The curvature may be smaller than the curvature of the second surface 9. In this case, the spectacle lens 1 is a myopia spectacle lens and a negative lens having a minus power.

  In the present embodiment, the first surface 8 may be a spherical surface or an aspherical surface. The second surface 9 may be a spherical surface or an aspherical surface. Further, the spectacle lens 1 may be a single focus lens or a progressive focus lens.

It is a flowchart which shows an example of the manufacturing method of the spectacle lens which concerns on this embodiment. It is a schematic diagram for demonstrating an example of the manufacturing method of the spectacles which concerns on this embodiment. It is a schematic diagram for demonstrating an example of the manufacturing method of the spectacles which concerns on this embodiment. It is a schematic diagram for demonstrating an example of the manufacturing method of the spectacles which concerns on this embodiment. It is a schematic diagram for demonstrating an example of the manufacturing method of the spectacles which concerns on this embodiment. It is a schematic diagram for demonstrating an example of the manufacturing method of the spectacles which concerns on this embodiment. It is a schematic diagram for demonstrating an example of the manufacturing method of the spectacles which concerns on this embodiment. It is a schematic diagram for demonstrating the manufacturing method of the spectacles which concerns on a comparative example. It is a schematic diagram for demonstrating the manufacturing method of the spectacles which concerns on a comparative example.

  DESCRIPTION OF SYMBOLS 1 ... Eyeglass lens, 2 ... Semi finish lens, 2k ... Polishing lens, 3 ... Front surface, 4 ... Holding member, 5 ... Back surface, 6 ... 1st part, 7 ... 2nd part, 8 ... 1st surface, 9 ... 1st 2 side, 15 ... 3rd side

Claims (7)

A method of manufacturing a spectacle lens,
A first process for generating a semi-finished lens;
A second treatment for holding the surface of the semi-finished lens with a holding member;
A third process for processing the back surface of the semi-finished lens to generate a first part to be the spectacle lens and a second part arranged around the first part;
A fourth process of processing at least a second surface opposite to the first surface of the first portion facing the holding member,
In the third process, the curvature of the second surface is different from the curvature of the third surface of the second portion arranged around the second surface. Production method.   The manufacturing method according to claim 1, wherein the curvature of the third surface is larger than the curvature of the second surface.   The manufacturing method according to claim 1, wherein the curvature of the first surface is larger than the curvature of the second surface.   The manufacturing method according to claim 1, wherein in the fourth treatment, the second portion protects the holding member.   The manufacturing method as described in any one of Claims 1-4 including the 5th process which coats the said semi-finished lens after the said 4th process.   The manufacturing method according to claim 1, wherein the second portion is removed at least after the fourth treatment.   The manufacturing method according to claim 1, wherein the second portion is an optically ineffective portion.

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